...First produced only in the past decade human induced pluripotent stem... The technology for generating these cells has been moving very quickl...Weiss with Monica Bessler M.D. Philip Mason Ph.D. and Deborah L. ...In DBA a mutation prevents a patient's bone marrow from producing nor...

First produced only in the past decade, human induced pluripotent stem cells (iPSCs) are capable of developing into many or even all human cell types. In new research, scientists reprogrammed skin cells from patients with rare blood disorders into iPSCs, highlighting the great promise of these cells in advancing understanding of those challenging diseasesand eventually in treating them.

"The technology for generating these cells has been moving very quickly," said hematologist Mitchell J. Weiss, M.D., Ph.D., corresponding author of two recent studies led by The Children's Hospital of Philadelphia (CHOP). "These investigations can allow us to better understand at a molecular level how blood cells go wrong in individual patientsand to test and generate innovative treatments for the patients' diseases."

Weiss, with Monica Bessler, M.D., Philip Mason, Ph.D., and Deborah L. French, Ph.D., all of CHOP, led a study on iPSCs and Diamond Blackfan anemia (DBA) published online June 6 in Blood. Another study by Weiss, French and colleagues in the same journal on April 25 focused on iPSCs in juvenile myelomonocytic leukemia (JMML).

In DBA, a mutation prevents a patient's bone marrow from producing normal quantities of red blood cells, resulting in severe, sometimes life-threatening anemia. This basic fact makes it difficult for researchers to discern the underlying mechanism of the disease: "It's very difficult to figure out what's wrong, because the bone marrow is nearly empty of these cells," said Bessler, the director of CHOP's Pediatric and Adult Comprehensive Bone Marrow Failure Center.

The study team removed fibroblasts (skin cells) from DBA patients, and in cell cultures, using proteins called transcription factors, reprogrammed the cells into iPSCs. As those iPSCs were stimulated to form blood tissues, like the patient's original mutated cells, they were deficient in producing red blood cells.

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